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Vibration actuator

A technology of vibrating actuators and vibrating components, applied in piezoelectric/electrostrictive/magnetostrictive devices, generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, etc., can solve the problem of device complication etc.

Inactive Publication Date: 2009-02-04
TOYOTA IND CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the vibration actuator of Patent Document 1 has a problem in that it uses one composite vibrator to rotate one rotor. Therefore, when trying to rotate a plurality of rotors separately, it is not only necessary to separately install a dedicated actuator for each rotor. compound vibrator, and it is necessary to drive and control multiple compound vibrators corresponding to multiple rotors independently of each other, making the device more complicated

Method used

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no. 1 Embodiment approach

[0031] figure 1 shows the vibration actuator according to the first embodiment of the present invention. This vibration actuator is an ultrasonic actuator that uses ultrasonic vibration to rotate a rotor, and includes an actuator main body 1 and two rotors A and B necessary for rotationally driving the actuator main body 1 . The actuator main body 1 has a cylindrical composite vibrator 2 and a first stator 3 and a second stator 4 respectively arranged at both ends of the composite vibrator 2 . The first stator 3 and the second stator 4 sandwich the composite vibrator 2 and are connected to each other by connecting bolts 5 passing through the composite vibrator 2 to form an actuator body 1 with an approximately cylindrical shape. Here, for the convenience of description, the central axis of the actuator body 1 from the second stator 4 toward the first stator 3 is defined as the Z axis, the X axis extends in the vertical direction of the Z axis, and the Y axis is related to the...

no. 2 Embodiment approach

[0054] Next, refer to Figure 12 A vibration actuator according to a second embodiment of the present invention will be described. In this second embodiment, in addition to the first embodiment, the composite vibrator 2 has the first piezoelectric element portion 31 that generates flexural vibration in the Y-axis direction and the second piezoelectric element portion 31 that generates longitudinal vibration in the Z-axis direction. In addition to the element portion 32, a third piezoelectric element portion 41 that generates flexural vibration in the X-axis direction is provided. The third piezoelectric element portion 41 has Figure 13 A pair of piezoelectric element plates 41b and 41d are shown. The two portions divided in the X-axis direction of the pair of piezoelectric element plates 41b and 41d have opposite polarities, and are polarized to exhibit opposite deformation behaviors of expansion and contraction in the Z-axis direction (thickness direction), respectively. ...

no. 3 Embodiment approach

[0059] Next, refer to Figure 14 A vibration actuator according to a third embodiment of the present invention will be described. The third embodiment is to replace the springs 12 and 13 used in the first embodiment and use a freely expandable rubber sleeve 51, so that the two rotors A and B are pressurized and respectively connected to the corresponding stators 3 and 4 touch. The rubber sleeve 51 has a cylindrical shape and covers the entire outer peripheral portion of the actuator body 1, and at the same time, its two ends are respectively fixed to the ends of the first rotor A and the second rotor B in a state stretched along the direction of the central axis. Peripheral parts. Utilizing the force of the rubber sleeve 51, the two rotors A and B are pressurized and come into contact with the corresponding corners 8 and 9 of the stators 3 and 4, respectively. Therefore, as in the first embodiment, the two rotors A and B can be driven to rotate by one composite vibrator 2 ....

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Abstract

The invention provides a vibration actuator capable of vibrating plural rotors by single vibration means. When a composite vibrator (2) is driven to generate a composite vibration where different vibrations are composed, a first stator (3) and a second stator (4) vibrate to form elliptic motion at each corner (8, 9) of the first stator (3) and a second stator (4). This causes a first rotor (A) pressed and made to be in contact with the corner (8) of the first stator (3) and a second rotor (B) pressed and made to be in contact with the corner (9) of the second stator (4) are simultaneously andindividually rotated. Also, selecting a vibration mode of the different vibrations that form the composite vibration enables the two rotors (A, B) to be rotated in the same direction or in the opposite directions.

Description

technical field [0001] The present invention relates to a vibration actuator, and more particularly, to a vibration actuator that vibrates a stator with a vibrating member to rotationally drive a rotor in contact with the stator. Background technique [0002] For example, Patent Document 1 discloses a vibration actuator that rotates a rotor using ultrasonic vibration. Such a vibration actuator has a composite vibrator composed of a plurality of overlapping piezoelectric element plates as a vibrating member, and one rotor is contact-supported by a stator arranged at one end of the composite vibrator. A drive voltage is applied to multiple piezoelectric element plates of the composite vibrator, multiple vibrations are generated in different directions, and at the same time, a composite vibration composed of these vibrations is formed, and the stator vibrates. This drives the rotor in rotation. [0003] Patent Document 1: JP-A-11-220892 [0004] However, the vibration actuat...

Claims

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Application Information

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IPC IPC(8): H02N2/00
CPCH02N2/108H02N2/0035H02N2/106H01L41/092H10N30/2027H02N2/00H02N2/02
Inventor 高三正己石川洋彦清木和夫中村健太郎上羽贞行
Owner TOYOTA IND CORP
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